Below is a list of Ionia MO zip codes. For your research we have also included Ionia Area Code, Time Zone, UTC and the local Benton County FIPS Code. Each Ionia Missouri zip code has a center Longitude / Latitude point (the Ionia center is -93.323699951172 / 38.501399993896). For your convenience we have also indicated if that zip code in Ionia observes Daylight Savings time.